1906.] OF SOUTHERN INDIA AND CEYLON. 657 



pleurales hamati. Prostata magna." There is perhaps not much 

 essential difference between a velvety surface and one which is 

 covered with elongate soft papillae (Thordisa), but, so far as the 

 two can be distinguished, the form under consideration belongs 

 decidedly to Thordisa. In Thordisa the outermost teeth are 

 typically pectinate or denticulate, which is not the case in 

 Dimdula. But, as explained above, I do not think that this is 

 a safe generic characteristic, Diaulula has a large prostate, but 

 the organ is also reported as present in Th. macidigera (Bergh, 

 Danish Expedition to Siam, Opisthob. p. 184), Th. dubia, and 

 Th. pallida. 



It is not impossible that this form should be referred to Phialo- 

 doris, which has a penis of similar shape and a prostate. The 

 radula presents no essential differences. But in Phialodoris the 

 nervous system is not concentrated. The dorsal svirface is 

 crammed with spicules, which seem to be set in a stellate pattern, 

 and is described as granulate. Its appearance in life, however, 

 may have been different. 



On the whole, it appears to me safest to leave the present form 

 provisionally in Thordisa until a further examination of Phialo- 

 doris podotria (described from one alcoholic specimen) has been 

 made. The specific name crosslandi has priority over gigantea. 



Kelaart's Doris marmorata is not improbably Phialodoris 

 podotria. It is " hard and granular," and the six branchial 

 plumes are united at the base. Cf. Brock's figure reproduced by 

 Bei-gh, in Semper's Reiseri, Heft xvii. pi. Ixxxv. figs. 5 & 6. 



Trippa. 



This genus, in which Bergh has incorporated Phlegmodoris, 

 is characterised externally by a rather soft consistency and com- 

 pound tubercles of irregular shape. Between the tubercles there 

 are often deep pits rendered conspicuous by their black colour. 

 There is no labial armature, and the radula, which is generally 

 rather short, consists of hamate teeth which sometimes bear a few 

 denticles. Ptyaline glands as well as salivary glands are present. 

 There is no armature in the genitalia and a prostate seems not to 

 be i-ecorded. 



The following forms are perhaps referable to the genus : — 



1. T. ornata Bergh. 



(? = Doris intecta Kelaart.) 



2. T. areolata (A. & H.). 



3. T. spongiosa (Kelaart). 

 { = T. mephitica Bergh.) 



4. T. monsoni Eliot. 

 {% = D. leoparda Kelaart.) 



5. T. hispida Bergh. 



6. T. affinis Bergh. 



7. T. luteola (Kelaart). 

 (= Thordisa caudata Farran.) 



44* 



